PACCAR MX-13 vs MX-11: Engine Size for Your Application

The MX-13 produces up to 510 HP and 1,850 lb-ft of torque — adequate for virtually any Class 8 application. The MX-11 maxes at 430 HP and 1,550 lb-ft, sufficient for lighter applications but limited for heavy haul or mountainous terrain.

The MX-11 is lighter and smaller, producing 3-5% better fuel economy in applications where its power is sufficient. For regional haul and medium-weight loads, the MX-11's efficiency advantage is measurable.

The MX-11 weighs approximately 400-500 lbs less than the MX-13. For weight-sensitive applications, this translates directly to more payload capacity. Combined with a lighter transmission, the total drivetrain savings can approach 800 lbs.

The MX-13 handles any load, any terrain, any application. From lightweight dry van to 80,000 lb gross weight, it has power to spare. The MX-11 is optimized for specific applications and may struggle under maximum loads or steep grades.

The smaller MX-11 uses less oil per change, smaller filters, and lighter-duty components — resulting in marginally lower maintenance costs per service interval.